一、VTK光照

通过设置光照，可以达到不同颜色的目的，参考博客：

VTK修炼之道7_三维场景基本要素:光照_vtk 光照_沈子恒的博客-CSDN博客

1、关于vtkLight常用的方法

SetColor() — 设置光照的颜色（一般是设置rgb）

SetPosition() — 设置光照位置

SetFocalPoint() — 设置光照焦点

SetIntensity() — 设置光照的强度

SetSwitch() / SwitchOn()/ SwitchOff()— 打开或关闭对应的光照。

#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkLight.h>
#include <vtkCamera.h>
#include <vtkProperty.h>
int main()
{//设置圆vtkSmartPointer<vtkSphereSource> sphere =vtkSmartPointer<vtkSphereSource>::New();sphere->SetCenter(0, 0, 0);sphere->SetRadius(2.0);sphere->SetThetaResolution(15);sphere->SetPhiResolution(15);sphere->Update();//设置mappervtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();mapper->SetInputConnection(sphere->GetOutputPort());//设置actorvtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();actor->SetMapper(mapper);//设置vtkRenderervtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();renderer->AddActor(actor);renderer->SetBackground(0, 0, 0);vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();renWin->AddRenderer(renderer);renWin->SetSize(640, 480);renWin->Render();renWin->SetWindowName("Lights");vtkSmartPointer<vtkRenderWindowInteractor> vtkren = vtkSmartPointer<vtkRenderWindowInteractor>::New();vtkren->SetRenderWindow(renWin);vtkSmartPointer<vtkInteractorStyleTrackballCamera> style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();vtkren->SetInteractorStyle(style);//添加光照1（绿光）vtkSmartPointer<vtkLight> myLight1 = vtkSmartPointer<vtkLight>::New();myLight1->SetColor(0, 1, 0);myLight1->SetPosition(0, 0, 6);myLight1->SetFocalPoint(renderer->GetActiveCamera()->GetFocalPoint());renderer->AddLight(myLight1);//添加光照2（蓝光）vtkSmartPointer<vtkLight> myLight2 = vtkSmartPointer<vtkLight>::New();myLight2->SetColor(0, 0, 1);myLight2->SetPosition(0, 0, -6);myLight2->SetFocalPoint(renderer->GetActiveCamera()->GetFocalPoint());renderer->AddLight(myLight2);vtkren->Initialize();vtkren->Start();return 0;
}

2、最终效果

二、相机设置

1、相机设置

相机位置：vtkCamera::SetPosition()或者GetPosition（）
相机焦点：GetFocalPoint或者是SetFocalPoint
投影视角：(View Angle)，默认的视角大小为30º，GetViewAngle()或者是SetViewAngle（）

#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkConeSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkLight.h>
#include <vtkCamera.h>
#include <vtkProperty.h>
int main()
{vtkSmartPointer<vtkConeSource> cone = vtkSmartPointer<vtkConeSource>::New();cone->SetRadius(0.5);cone->SetCenter(0, 0, 0);//设置mappervtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();mapper->SetInputConnection(cone->GetOutputPort());//设置actorvtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();actor->SetMapper(mapper);//设置vtkRenderervtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();renderer->AddActor(actor);renderer->SetBackground(0, 0, 0);vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();renWin->AddRenderer(renderer);renWin->SetSize(640, 480);renWin->Render();renWin->SetWindowName("Camera");vtkSmartPointer<vtkRenderWindowInteractor> vtkren = vtkSmartPointer<vtkRenderWindowInteractor>::New();vtkren->SetRenderWindow(renWin);//获取默认相机参数vtkSmartPointer<vtkCamera> activeCamera = renderer->GetActiveCamera();double position[3] = { 0.0,0.0,0.0 };activeCamera->GetPosition(position);cout << "Default position:" << position[0] << "," << position[1] << "," << position[2]<<endl;//0,0,3.2double focalPoint[3] = {0.0,0.0,0.0};activeCamera->GetFocalPoint(focalPoint);cout << "Default Focal Point:" << focalPoint[0] << "," << focalPoint[0] << "," << focalPoint[2] << endl;//0,0,0double viewAngle = activeCamera->GetViewAngle();cout << "viewAngle:"<< viewAngle << endl;//加入自己的相机参数vtkSmartPointer<vtkCamera> myCamera = vtkSmartPointer<vtkCamera>::New();position[0] = 0.0;position[1] = 0.0;position[2] = 1.0;myCamera->SetPosition(position);focalPoint[0] = 0;focalPoint[1] = 0;focalPoint[2] = 0;myCamera->SetFocalPoint(focalPoint);viewAngle = 45.0;myCamera->SetViewAngle(viewAngle);renderer->SetActiveCamera(myCamera);//添加光照1（绿光）vtkSmartPointer<vtkLight> myLight1 = vtkSmartPointer<vtkLight>::New();myLight1->SetColor(0, 1, 0);myLight1->SetPosition(0, 0, 6);myLight1->SetFocalPoint(renderer->GetActiveCamera()->GetFocalPoint());renderer->AddLight(myLight1);vtkren->Initialize();vtkren->Start();return  0;
}

将renderer->SetActiveCamera(myCamera);这句屏蔽，可以看到最初效果如下：